Return type deduction

[Rory McGuire via Digitalmars-d]

On Mon, Sep 5, 2016 at 11:59 AM, Andrea Fontana via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> I asked this some time (years?) ago. Time for a second try :)
>
> Consider this:
>
> ---
>
> T simple(T)() { return T.init; }
>
>
> void main()
> {
>         int test = simple!int(); // it compiles
>         int test2 = simple();    // it doesn't
> }
>
> ---
>
> Is there any chance to implement this kind of deduction?
> Please notice that it doesn't break any existing code, I guess.
>
> For example using my json wrapper [1] this sounds a bit pedantic:
>
> ----
> user.name = json.get!string("info/name");
> user.age  = json.get!int("info/age");
> ----
>
> If return type deduction could be implemented it would be:
>
> ----
> user.name = json.get("info/name");
> user.age  = json.get("info/age");
> ----
>
> [1] https://code.dlang.org/packages/jsonwrap
>
> Andrea
>


user.name = json.get!(info.name);

or

user.name = json!(info.name);


possible right now. No language changes. Shorter. No strings. compile time
type verification.

limitation:
can't do runtime loading of unknown json structure (but then neither does
your proposal).

R
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